The LH0981 Leviton 13661-SWP is a G13 medium bipin lampholder / socket / tombstone for T8 or T12 LED or fluorescent tubular lamps. It is non-shunted and has a locator post / stop / pin. The Leviton 13661-SWP is rotary locking which allows the lamp to be inserted and rotated to lock it in place. It has 23 mm lamp center height.
Link to T8, T10, T12, lamps that fit this socket